Steam-generator.



No. 661,868. 'Patented Nv. I3, |900.

4J. HALLETT L G. HALLlnAY. STEAM GENERATOR.

(Application led Jan. 20. 1900.)

(No Model.)

2 Sheets-Sheet l.

Luv enla v s www@ Paten'fed` Nov. I3, |900. J. HALLETT & G. HALLIDAY.

STEAM GENERATOR.

(Appl c nfildJ n 2o 1900) 2 Sheets-Sheet 2.

(No Model.)

lnuentovs 60s @yh Home Dnlnesse George Hau'uals UNITED STATES PATENT Ormea JOSEPH HALLETT AND GEORGE HALLIDAY, OF- LONDON, ENGLAND.

STEAM-G EN ERATOR.

SPECIFICATION forming` part of Letters Patent No. 661,868, dated November 13, 1900.

Original application filed October 2, 1899, eei'ial No. 732,364. Divided and this application filed January 20. 1900. Serial No.

' 2,136. Nomaden) fo @ZZ whom zit may concern:

Be it known that we, J osEPH HALLETT and GEORGE HALLIDAY, subjects of the Queen of Great Britain and Ireland, residing, respectively, at the city of London and Bedford Square, London, England, have invented Steam-Generating Elements for Steam-Boilers, of which the following is a specification.

This invention has reference to water-tube boilersl of the kind having one or more steamgenerating elements or sections (hereinafter called elements) arranged within a suitable casing and comprising or each comprising two water chambers or headers (hereiniuafter called headers) connected to one or more steam and Water drums arranged above them, inclined water-tubes Connecting the inner walls of said headers and arranged abcve a fire grate or grates, and flue-tubes connecting the onter walls of the headers and extending centrally through the water-tubes or some of them, so as to form therewith annular water-spaces, the arrangement kbeing such that iiaine and hot gases can pass over and among the watertubes and also through the fine-tubes on their Way to the chimney.

In such steam-generating elements it has heretofore been usual to make each of the headers practically in one piece as a casting or of a plate of wrought metal bent upon itself or of plates permanently fixed at the required distance apart by riveting and to introduce the water-tubes through holes in the outer plate and secure them in holes in the inner plate, the flue-tubes beingsubsequently iixed in the outer plates of the two headers. With this construction great difficulty is experienced in securely fixing the water-tubes in the inner plates or walls of the headers and access cannot readily be gained to such water-tubes for' the purpose of cleaning, stopping, withdrawing, or replacing them or for gaining access to the interior of the headers for examining or cleaning the same.

Now this invention, which is a division of our application for Letters Patent, filed October 2, 1899, Serial No. 732,364, is designed to obviate the foregoing disadvantage, for which purpose the inner Wall or plate of each header is dished and anged, and-,the outer plate is fixed thereto by studs or bolts and nuts, so

`it by studs h and nuts t.

l that it can be readily removed therefrom together, it may be, with the whole of the iiuetubes secured thereto if the other ends of such tubes be detached from the outer wall or plate of the opposite header.

Figure l of the accompanying illustrative drawings shows partly in end elevation and partly in transverse section a boiler having a steamgenerating element constructed according to this invention. Figs. 2, 3, and 4 are enlarged sectional detail views.

ot and b are the two headers, c the watertubes secured to the inner walls (l of the said headers, and c due-tubes extending through the water-tubes c and connected, as hereinafterdescribed, to the outer walls f of the headers.

To enable access to be gained in a simple and ready manner to the interior of the headers for inspecting and cleaning the same and for gaining access to the water-tubes c for the purpose of cleaning, stopping, or withdrawing and replacing such tubes, the inner Wall g of each header is made of a dished shape and is provided with a removable outer wallf, that is attached to the flanged part g of' the inner wall d by studs or bolts and n urs, the arrangement being such -that the outer wall fcan be easily removed when desired. In Figs. l and 2 the flanged part g is turned outwardly and the outer wall fis secured lo In Figs. 3 and et, which are respectively part vertical and hori- `zontal sections, the hanged part g is turned inward and the outer wall fis secured to it by bolts 7c and nuts t', as shown in Fig. 3.

To enable the line-tubes c to be securely fixed in a simple and readily-detachable man- Vner to the outer wallsj' of the headers c and b, each end of each line-tube is provided with a collar Z and nut fm, that are adapted to be fixed against opposite sides of a plug n, which surrounds the tube end and is screwed into a hole o in the outer wallfof the header, the collar Z being of such size as to admit of its being passed through the corresponding Water-tube c. By making the plugs 'n and holes 0 of sufficiently large diameter the watertubes c can be cleaned, stopped, or withdrawn and replaced, as may be desired, Without removing the outer wall j' of the header. By

IOO

' served.

What we claim isy l. A steam-generating element having two headers and concentrically-arranged water and flue tubes connecting the same, each header comprising a single inner dished wall to which the water-tubes are secured, and provided with a hanged rim, and a separate single outer plane Wall to which the corresponding ends 'of the line-tubes are attached said outer wall being removably secured to the flanged rim of said inner wall, substantially as described.

2. A steam-generating element having two headers and concentrically-arranged water and flue tubes connecting the same, each header comprising a single inner dished wall to which the water-tubes are secured, and provided with a flanged rim, a separate single removable outer plane Wall to which the corresponding ends of the flue-tubes are attached, and studs or bolts and nuts connecting said inner and outer plates, substantially as dcscribed.

3. A steam-generating element having two headers and concentrically-arranged Water and line tubes connecting the same, each header comprising a single inner dished wall to which the water-tu bes are secured, and provided with a flanged rim, a single outer plane wall removably secured to said flanged rim and formed with holes arranged opposite the ends of said water-tubes, hollow plugs screwed into said holes, and fluetubes extending through said water-tubes and through-the holes in said plugs and carrying abutting parts bearing against opposite sides of said plugs, substantially as described.

4. A steam-generating element having two headers and concentrically-arranged water and iiue tubes connecting the same, each header comprising a single inner dished wall to which the water-tubes are secured, and provided with a hanged rim, a single outer plane wall removably secured to said hanged rim and formed with holes arranged opposite the ends of said water-tubes, hollow plugs screwed into said holes, and line-tubes extending through said Water-tubes and through the-holes in said plugs, and each provided at each end with a collar and nut abutting against the inner and outer sides respectively ofthe corresponding plug substantially as described.

5. In a steam-generating element having two headers and concentrieally-arranged water and flue tubes connecting the same, the combination in each header of the inner wall CZ having the outwardly-inclined portion, and theinwardly-langed portion g approximately parallel with the inner wall cl, the removable outer plane Wall f, and the bolts and nuts connecting said outer Wall to said inwardlylianged portion, substantially as described.

6. In a stean1-generating element having two headers and concentrically-arranged water and flue tubes connecting the same, the combination in each header of the inner dished wall d the removable outer plane wall f formed with holes o, the hollowplugs w screwed into said holes, and the flue-tubes e extending through said plugs and provided with the collar Z and n ut m abutting against opposite sides of said plugs, substantially as described.

7. A steam-generating element comprising 1 two headers each com posed of a single dished of the water-tubes and through the corre- Ico spondingscrew-plugs and each formed nearits ends with collars that are of smaller diameter than the internal diameter of the water-tube through which the iiue tube extends and which abut against the inner ends of the cor- 105 responding screw-plugs, and nuts screwed on the outer ends of said flue-tubes and abutting against the outer ends of said plugs, substantially as described.

Signed at 77 Cornhill, inthe city of Lon- 11o don, England, this 6th day of January, 1900.

JOSEPH HALLETT. GEORGE HALLIDAY. Witnesses: WM. VO. BROWN, PERcY E. MA'rrrooKs. 

